This is actually an interesting question. I would not say that I hate Christmas, but I will say that I do not for the most part enjoy it, and it does lower my mood rather than the opposite. This, in my case at least, seems related to my childhood experiences with the holiday. My family was poor at times, so there was not a lot of money for presents for the four boys. Childhood Christmases were invariably stressful and in the end disappointing, if not, in the eyes of a little kid, tragic. Stuff like that lingers on.
So, my dearest is patient with me, she decorates the tree, and doesn't mind too much that I don't get into it any more than needed, being a bit taller (not much), and stronger (quite a bit). And by keeping a lid on excess, we both enjoy it as much as doable.